"Winemaking as a rule here is as natural and non-interventionist as possible. All fermentation is carried out with indigenous yeasts, which can take a remarkably long time to complete: six to eight months is not at all unusual for Collin, and even when tasting vins clairs in June or July, they are typically still in the middle of their alcoholic fermentations. Both the fermentation and malolactic are carried out in three- to six-year old barriques, and the wine is neither fined nor filtered before bottling, which takes place in the fall after the harvest." – Peter Liem, Champagneguide.net